Ancient Document Rule

Under the Federal Rules of Evidence, a permissible method to authenticate a document. Under the rule, if if a document is (1) more than 20 years old; (2) is regular on its face with no signs of obvious alterations; and (3) found in a place of natural custody, or in a place where it would be expected to be found, then the document is found to be prima facie authenticated and therefore admissible.